Alert archive / Oklahoma / Tornado Warnings in 2021

Tornado Warning 31, NWS Shreveport, LA

October 10, 2021McCurtain County, Oklahoma

NWS Shreveport, LA issued this tornado warning at Oct 10, 2021, 11:50 PM CDT for McCurtain County, Oklahoma. It was in force for 40 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Oct 10, 2021, 11:50 PM CDT (04:50 UTC)
Expired: Oct 11, 2021, 12:30 AM CDT
In force: 40 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County McCurtain County, OK

The radar

The Western Arkansas radar (KSRX), 136 km from the middle of the area, began a volume at 04:49 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Oct 11, 12:20 AM CDT	TSTM WND DMG	3 Wnw Broken Bow, OK	TREES DOWN ON VEHICLE 3 MILES WEST OF BROKEN BOW ON HWY 3.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Oct 10, 11:07 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 4.8 hours before the alert went out and 208 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 193 J/kg
Mixed-layer CIN: -245 J/kg
Mixed-layer LCL: 1467 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 188 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

818 
WFUS54 KSHV 110450
TORSHV
OKC089-110530-
/O.NEW.KSHV.TO.W.0031.211011T0450Z-211011T0530Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Shreveport LA
1150 PM CDT Sun Oct 10 2021

The National Weather Service in Shreveport has issued a

* Tornado Warning for...
  Central McCurtain County in southeastern Oklahoma...

* Until 1230 AM CDT.
    
* At 1149 PM CDT, a severe thunderstorm capable of producing a
  tornado was located 15 miles west of Broken Bow, or 29 miles east
  of Hugo, moving northeast at 55 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This tornadic thunderstorm will remain over mainly rural areas of
  central McCurtain County, including the following locations...
  Plunketville, Wright City, Glover, Hochatown, Millerton, Watson,
  Slim, Oak Hill and Golden.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3394 9501 3412 9513 3448 9447 3416 9448
TIME...MOT...LOC 0449Z 236DEG 47KT 3408 9499 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

44

1 follow-up statement

822 
WWUS54 KSHV 110520
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
1220 AM CDT Mon Oct 11 2021

OKC089-110530-
/O.CON.KSHV.TO.W.0031.000000T0000Z-211011T0530Z/
McCurtain OK-
1220 AM CDT Mon Oct 11 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT FOR
NORTHEASTERN MCCURTAIN COUNTY...
    
At 1219 AM CDT, a severe thunderstorm capable of producing a tornado
was located 13 miles southwest of Vandervoort, or 22 miles northwest
of De Queen, moving northeast at 55 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Broken Bow, Hochatown, Plunketville and Watson. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3404 9477 3425 9489 3448 9447 3416 9448
TIME...MOT...LOC 0519Z 236DEG 47KT 3430 9459 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

44

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 10, 11:24 PM CDT	Severe Thunderstorm Warning	SHV	McCurtain	66 min
Oct 11, 12:26 AM CDT	Severe Thunderstorm Warning	SHV	McCurtain	64 min

Nearby

Tornado Warnings in Oklahoma, 2021 Every tornado warning in 2021 Tornadoes in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.